Patients with LGI1, IgLON5, DPPX and GABABR antibodies have been misdiagnosed with Parkinson’s disease (PD), progressive supranuclear palsy (PSP), cortico-basal syndrome (CBS) or multisystem atrophy (MSA) [45,62,63,64,65]. This evidence concerns the gene IGLON5 and Parkinson disease.